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%%% outline
%-------------------------------------------------------------------------
\begin{tikzpicture}

\begin{axis}[
width=10cm,height=6cm,
legend style={legend pos=north west,font=\footnotesize,align=center},
xtick={-5,-4,-3,-2,-1,0,1,2,3},
ytick={-2,-1,0,1,2,3},
x tick label style={font=\scriptsize},
y tick label style={font=\scriptsize},
xmin=-5,xmax=3,
ymin=-2,ymax=3,
y tick style={opacity=0},
x tick style={opacity=0},
grid=major,
title={\small\bfnew{Swish}},
]

\addplot[cyan,smooth,thick]{x*(1+exp(-10*x))^-1};
\addplot[red,smooth,thick]{x*(1+exp(-1*x))^-1};
\addplot[brown,smooth,thick]{x*(1+exp(-0.1*x))^-1};
\addplot[gray!60, very thick] coordinates {(0,-2) (0,3)};
\addplot[gray!60, very thick] coordinates {(0,0) (3,0)};
\legend{$\beta=0.1$,$\beta=1.0$,$ \ \ \beta=10.0$}
\end{axis}
\end{tikzpicture}




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